docs: def ToPhotlam(self, wave, flux, **kwargs):
          """Convert to ``photlam``.
  
          .. math::
  
              \\textnormal{photlam} = 10^{-0.4 \\; \\textnormal{vegamag}} \\; f_{\\textnormal{Vega}}
  
          where :math:`f_{\\textnormal{Vega}}` is the flux of
          :ref:`pysynphot-vega-spec` resampled at given wavelength values
          and converted to ``photlam``.
  
          Parameters
          ----------
          wave, flux : number or array_like
              Wavelength and flux values to be used for conversion.
  
          kwargs : dict
              Extra keywords (not used).
  
          Returns
          -------
          result : number or array_like
              Converted values.
  
          """
          resampled = self.vegaspec.resample(wave)
          return resampled.flux * 10.0**(-0.4 * flux)